Final answer:
Ginnie Mae issues pass-through certificates that are guaranteed by the entity and backed by the full faith and credit of the United States.
Step-by-step explanation:
The secondary market entity that issues pass-through certificates guaranteed by the entity itself and backed by the full faith and credit of the United States is Ginnie Mae (Government National Mortgage Association). These securities are known as mortgage-backed securities, and Ginnie Mae's guarantee assures investors that even if the underlying mortgages default, they will still receive their payments of principal and interest. Ginnie Mae stands apart from the other options provided, such as Fannie Mae and Freddie Mac, which are government-sponsored enterprises but do not have the full backing of the U.S. government.